I would agree. I think the author is a bit harsh in his views on OSAS.
I believe the author is responding to the belief that a man could become "carnal" and live his life in a state of worldliness and still be saved. POTS would state that it's doubtful the person was ever saved to begin with because the Lord would chastise a true believer to a point of repentence. They would not be able to live their life in sin; keeping in mind that bringing a person to repentence could take days, years or even decades to achieve as the Lord wills. POTS eliminates the idea that a man could become a Christian, "fall" away from the faith in some "carnal" state, and go out and live their lives anyway they want, never again to return to the fold. It can't happen.
Personally, as Dr. E stated there isn't much difference between the two views. Trying to sound objective and fair, and as one who believed in OSAS for many years with my Baptist leanings, POTS has far more scriptural backing than OSAS and simply makes more sense. I would suggest studying the scriptures that are posted on the website and see if you don't concur.
"Personally, as Dr. E stated there isn't much difference between the two views."
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I guess that's the rub, I am not seeing the differences. I will read the web site.